'RUNNING WILD WITH BEAR GRYLLS': Actor Tom Arnold, left, is taken on a trek along Oregon's unpredictable coastline with survivalist Bear Grylls. (Duncan Gaudin/NBC)

Two new bachelorettes arrive and cause romantic complications, Chris B. sustains a serious injury and two contestants unexpectedly leave paradise for good on “Bachelor in Paradise” (ABC at 8 p.m.).

“Running Wild With Bear Grylls” (NBC at 8) hosts Tom Arnold this week, with wild man Grylls taking the “True Lies” actor and comedian to Oregon’s unpredictable coastal mountains.

FINALE WATCH: The recently renewed “Switched at Birth” (ABC Family at 8) closes its third season with shocking news about Carlton that threaten graduation day and John and Kathryn learning of Bay’s post-grad plans.

The eight remaining chefs split into teams of two to prepare a poultry dish using various parts of the chicken on “MasterChef” (Fox at 8).

RETURNING SHOW: For its 21st cycle, “America’s Next Top Model” (CW at 9) welcomes men back into the competition with a preliminary selfie competition and Miss J back to the judging panel.

The 90-minute documentary “Captivated: The Trials of Pamela Smart” (HBO at 9) revisits the trial of Pamela Smart, a New Hampshire woman accused in 1990 of plotting to murder her husband — a case where the coverage is theorized to have given birth to reality TV.

RETURNING SHOW: “Fast N’ Loud” (Discovery at 9) Season 5 launches with Part 1 of a 1931 Ford Model A renovation and the rebuilding of a 1960s show car from the ground up.

RETURNING SHOW: On hiatus since April, “Dallas” (TNT at 9) returns to wrap up Season 3 with the Ewings seeking answers about the fire at Southfork Ranch, while John Ross and Emma deal with their role in Pamela’s overdose.

Barbie enlists the help of his father to reach out to Julia, but then realizes that Don may know more about the Dome than he initially thought on “Under the Dome” (CBS at 10).

Comedian Bill Cosby comes to “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35), along with golfers Tiger Woods and Rory McIlroy, and music from Royksopp and Robyn.

Actors Bruce Willis and Chadwick Boseman are on the “Late Show With David Letterman” (CBS at 11:35), along with musical guests the Gaslight Anthem.

Actors Rosario Dawson and Eric McCormack stop by “Jimmy Kimmel Live” (ABC at 11:35), with a musical performance from Self.

Rachel Lubitz